Aaltonen, T;
Gonzálezz, BÁ;
Amerio, S;
Amidei, D;
Anastassovx, A;
Annovi, A;
Antos, J;
... Zucchelliee, S; + view all
(2012)
Measurements of Angular Distributions of Muons From Upsilon Meson Decays in p p-bar Collisions at sqrt(s)=1.96 TeV.
Physical Review Letters
, 108
(15)
, Article 151802. 10.1103/PhysRevLett.108.151802.
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Abstract
The angular distributions of muons from Upsilon(1S,2S,3S) to mu+mu- decays are measured using data from proton anti-proton collisions at sqrt(s)=1.96 TeV corresponding to an integrated luminosity of 6.7 /fb and collected with the CDF II detector at the Fermilab Tevatron. This analysis is the first to report the full angular distributions as functions of transverse momentum pT for the Upsilon mesons in both the Collins-Soper and s-channel helicity frames. This is also the first measurement of spin alignment of Upsilon(3S) mesons. Within the kinematic range of Upsilon rapidity |y|<0.6 and pT up to 40 GeV/c, the angular distributions are found to be nearly isotropic.
| Type: | Article |
|---|---|
| Title: | Measurements of Angular Distributions of Muons From Upsilon Meson Decays in p p-bar Collisions at sqrt(s)=1.96 TeV |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.108.151802 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.108.151802 |
| Language: | English |
| Additional information: | © 2012 American Physical Society 8 pages, 5 figures, submitted to Phys. Rev. Lett |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1339344 |
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